<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
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<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
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<style>
.mm{
text-align:center;
}
</style>
</head> 
<body>
<li class="mm">
	<div id="navbar" >
	<form class="navbar-form navbar-right">
		<div class="form-group">
			<input type="text" placeholder="搜索关键字..." class="form-control">
				</div>
					<button type="submit" class="btn btn-success">search</button>
		</form>
	</div>
</li>
<div class="col-md-8 col-md-offset-2">
<div class="row">
<div class="col-md-4">
    <div class="thumbnail">
      <img src="d50735fae6cd7b89acbea9df032442a7d8330e9f.jpg" alt="..." style="width:160px;height:180px;">
      <div class="caption">
        <h3>物品1</h3>
        <p>介绍1</P>
        <p><a href="#" class="btn btn-primary" role="button">购买</a> <a href="#" class="btn btn-default" role="button">加入购物车</a></p>
      	</div>
    </div>
</div>
<div class="col-md-4">
    <div class="thumbnail">
      <img src="d50735fae6cd7b89acbea9df032442a7d8330e9f.jpg" alt="..." style="width:160px;height:180px;">
      <div class="caption">
        <h3>物品2</h3>
        <p>介绍2</p>
        <p><a href="#" class="btn btn-primary" role="button">购买</a> <a href="#" class="btn btn-default" role="button">加入购物车</a></p>
      </div>
    </div>
  </div>
 <div class="col-md-4">
    <div class="thumbnail">
      <img src="u=3332459869,1870470320&fm=27&gp=0.jpg" alt="..." style="width:160px;height:180px;">
      <div class="caption">
        <h3>物品3</h3>
        <p>介绍3</p>
        <p><a href="#" class="btn btn-primary" role="button">购买</a> <a href="#" class="btn btn-default" role="button">加入购物车</a></p>
      </div>
    </div>
  </div>


</div>
</div>
</body>
</html>